Mold for artificial stone.



PATENTED JUNE 28, 1904,

A. LAKE. MOLD FOR ARTIFICIAL STONE.

APPLIOATION'I'ILBD SEPT. 15, 1903.

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No. 763,679. PATENTED JUNE 28, 19,04.

A. LAKE. MOLD FOR ARTIFICIAL STONE.

APPLICATION FILED SEPT. 15, 1903.

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Patented June 28,1904

PATENT OFFICE.

ALBERT LAKE, OF 'WASHINGTON, DISTRICT OF COLUMBIA.

MOLD FOR ARTIFICIAL STONE.

SPECIFICATION forming part of Letters Patent No. 763,679, dated June 28, 1904.

Application filed September 15, 1903. Serial No. 173,304. (No model.)

[0 (I/ZZ 1072/0772, it may concern:

Be it known that I, ALBERT LAKE, a citizen of the United States of America, and a resident of Washington, District of Columbia, have invented certain new and useful Improvements in Molds for Artificial Stone; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to molds for making building blocks and stone, and has for its object to make a large number of continuous molds easily taken apart or knocked down and close to one another to enable the manufacture of stone rapidly and on a large scale; and it consists of a simple and efficient mold series capable of making continuous blocks subsequently to be cut or of making large numbers of individual blocks preferably hol low. I

Referring to the drawings, in which like parts are similarly designated, Figure 1 is a partial plan; Fig. 2, the transverse section thereof; Fig. 3, a partial longitudinal section; Fig. 4C, a plan view of the core; Fig. 5, a perspective thereof; Fig. 6, one-half of the core, showing the interiorlocking device. Fig. 7 shows a single trough having hinged knock down sides and a removable partition. Fig. 8 is a perspective view of the lock, and Fig. 9 is a section showing a modification of the cutting device.

vOn a suitable bed or floor 10, which is made of boards or cement and well leveled, is fixed a stationary partition 11, and at suitable distances from this partition are secured to the bed by means of hinges 12 side partitions 13, of which there may be several on each side of the center partition, depending upon the size and number of blocks to be made, said side partitions distanced from one another by the width of the block or stone to be molded.

Counter-sunk in the bed 10 are plates 14:, having holes 15, through which screws of the h nges may pass, so as to move the partitions to and from the center one, 11, to make a wider stone, and instead of using side partitions 13 hinged to the floor they may be secured by dowel-pins 38, Fig. 2, fitting correspondinglypositioned holes in the floor. Across the ends of these partitions is a hinged end board 16, having at each side braces 17, that take behind the farther partitions 13 of a set. This board is provided with a hook 18, taking into an eye 19 in the stationary central partition 11, whereby the end board is held in position. Any other looking or latching device may be used, and, if desired, one such may be placed at each partition or a pin 35, Fig. 1, passed through the end board into a partition 13. It will thus be seen that the structure described presents a series of knockdown troughs into which are placed at suitable distances apart hollow cores, which may be of simple boxlike form or collapsible, such as shown in Figs. 4, 5, and 6. At suitable distances between the cores and in the base-board or floor are continuous grooves 20, extending across the bed, one of which only is shown, and registering with these grooves are grooves 21 in the partitions, thereby forming a continuous groove around the interior of the mold, and in this groove are placed wires 22, the object of which is to cut the blocks apart or aid in cutting them apart after they have received their initial set, but before they have become too hard.

In order to maintain those partitions 13 situated between the central partition ll-and the last partition 13 on either side of the central partition in upright position, Iuse a look, if desired, or a simple bolt secured to the end board 16 and entering the ones 13 or a spreader, which consists of a simple piece of wood placed between the partitions, such as shown at 23.

The collapsible core comprises four parts a Z) 0 (Z, hinged together in pairs by hinges 24:, and each quarter of the core has a bottom 25, so that when the parts are locked together there is a cross-shaped opening through the bottom. Each side of the core is provided with brackets 26, into which takes a lockingrod 27. It will be observed that where the quarter a meets the quarter 6 I provide hinges 2 1,- the parts being beveled at 29 to allow collapsing, and where the sides of the mold meet they are also beveled, as at 30. The lockingbar 27 has enlarged ends 28, that have slightlyinclined faces 40, that draw the two halves of the core together. On the bottom of one of the core-sections is secured a plate 11, having a lug 42, on which is pivoted a rotary lockingpawl 13, that takes under the head of a pin 44, projecting from the floor. A spring 45 holds the pawl in locked position, and thereby locks the core in the mold and prevents it from being moved out of position.

In Fig. 7 I have shown a trough for molding two blocks, a partition 46 being slid into the grooves, said partition, as well as the ends, having prismatic blocks centrally secured thereto in order to make on the ends of the blocks V-shaped grooves to be filled with cement during the erection of the building. The mold parts may be made of either wood or metal, as desired.

The operation will be as follows: A suitable floor 10, of cement, is laid in the molding sheds, and upon this are placed oiled boards secured together to form a solid level floor. If desired, the boards may be omitted and the molds formed directly upon a smooth cement floor. The center board or partition 11 is fixed in place and consists of a long board of three-fourths of an inch or more in thickness, and placed at distances apart from the center board on each side of it of the thickness of one block to be molded are the side partitions 13, secured to the base by hinges 12 or dowel-pins, and across the ends of these long troughs are placed end boards 16. The wires 22 are next placed in the grooves 20 21. The cores are then set in the long troughs and the cement mixture put into them. As soon as the cement has its initial set the wires 22 are pulled up to cut the blocks apart; but preferably an iron plate beveled or having a knife-edge is run down into the grooves 20 21 to cut the blocks apart, and then the wires 22 are pulled up to clear the cut thus made.-

If desired, partitions may be placed in these grooves 20 21 and independent blocks be molded instead of a continuous block,as shown in Fig. 7. In order to form half-sized blocks, I place a partition 36 midway the length of-a single block, using a correspondingly-smaller core. These partitions have their edges faced with rubber, felt, or other yielding material 37, that permits them to be frictionally held in place. The locking-bars 27 in the cores are then moved in the direction of the arrow, Fig. 6, to clear the brackets 26, when the parts of the core a b can be collapsed, as shown in dotted lines, Fig. 5. They are then withdrawn, and the parts 0 d are similarly collapsed and withdrawn. The end boards 16 are then unlatched from the partitions and dropped down, when the partitions 13 at the ends of the board 16 can be dropped. The stones in the farthest compartment or trough are then removed and the next partition 13 is then dropped, and so on until all the stones have been removed from the mold.

In practice it is customary to have a mixing-trough running on a track at the ends of the troughs and from which the troughs, with the cores held in position, are filled.

As described above, a plate may be run into the grooves 21 to cutthe blocks or the wires 22 pulled up after the initial set, thus leaving slightly-roughened ends to the blocks, that facilitates the adherence of cement or cement mortar during the erection of the building; but where the stone used in the making of the blocks is rather large the device for cutting the blocks apart (shown in Fig. 9) is preferable, when the mold-floor 10 is raised sufficiently for a thin metal plate 50 to drop through slots 53, registering with grooves 21. The wires or rods 51, secured to the plate 50, are provided with handles 52 and lie in the vertical grooves 21, so that before setting or after the stone is set sufficiently the plate 50 may be drawn up through the material in a manner similar to the wires 22.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. The combination with amolding-fioor, of a fixed central partition, knockdown side partitions and end boards, means on the end boards to take behind and hold the two farthest side partitions in molding position, and means to lock the end boards to the partitions, substantially as described.

2. The combination with a molding-floor having transverse grooves therethrough, of a fixed central partition and side partitions having grooves therein registering with those in the fioor, end boards and means to engage the grooves in each channel thus formed to be pulled through the material to cut it into blocks, substantially as described.

3. The combination with a molding-floor having transverse grooves therein, of a fixed central partition and side partitions having grooves in each side to register with those in the floor, end boards and wires set in said grooves in each channel thus formed, substantially as described.

4:. The combination with a molding-floor having transverse grooves therein, knockdown partitions having grooves registering with those in the floor and end boards, of collapsible cores set in the channels so formed, substantially as described.

5. The combination with a molding-floor having transverse grooves therein, knockdown partitions having grooves registering with those in the floor and end boards, of a sectional core, each section comprising two hinged portions and means to lock the sections together, substantially as described.

6. The combination with a molding-floor having transverse grooves therein, knockdown partitions having grooves registering with those in the floor and end boards, of a core comprising two sections, each section comprising two parts hinged together beveled at the hinge-point and on the outer edges, lockingbrackets on each part, and a locking-bar adapted to enter said brackets to lock the parts together, substantially as described.

7. The combination with a knockdown mold having a pin provided with a head, projecting from the bottom, of a core, a locking-pawl secured to the core and adapted to take under thehead of said pin, substantially as described.

8. The combination with a knockdown mold having a pin provided with a head, projecting from the bottom, of a core, a plate secured to the inside of the core, a locking-pawl pivoted thereto and projecting through the bottom to engage the head of said pin, substantially as described. A

9. The combination with a molding-trough, having knockdown sides and ends, and circumferential internal grooves positioned between separate blocks to be cast, of a cutter-plate, below the trough and means to draw it through the trough and into the grooves after the material has been run in, substantially as described. I

10. The combination with a molding-trough open at the top, of a cutter-plate below the trough and means to draw it up into the trough and through the material therein, substantially as described.

11. The combination with a molding-trough having lateral grooves, of a cutter-plate below the trough, lifting wires or rods lying in the grooves and connected to the plate to draw it up through the material, substantially as described.

12. The combination with a mold, of a rectangular collapsible core having divided ends hinged together and divided sides, means to lock the core parts together and means to lock the core to the mold, substantially as described.

13. The combination with a mold-floor having pins therein, of cores, a plate fixed on the bottom of each core, a lever pivoted to the plate and means on the lever to engage a pin, substantially as described.

14:. The combination with a molding-floor having transverse grooves extending through the floor, of adjustable partitions having grooves to register with those in the floor, end boards, headed pins in the floor intermediate the grooves therein, collapsible cores, locking members secured to the bottoms of the cores to engage the headed pins and cutter-plates below the floor, lifting wires or rods secured to the plates and lying in the grooves in the adjustable partitions to lift the plates through the material into the grooves, substantially as described.

15. The combination with a moldingtrough, of a two-part core, each part being collapsible, means to lock the parts together and a spring-held latch to lock the assembled core in the trough, substantially as described.

16. The combination with a moldingtrough, of a plurality of cutter-plates below the trough and means to lift the cutter-plates into the trough after it has been filled with cement mixture, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

ALBERT LAKE.

Witnesses:

J. W. BUNN, HENRY ORTH, J r. 

